Examination of electron transfer through DNA using electrogenerated chemiluminescence

37Citations
Citations of this article
8Readers
Mendeley users who have this article in their library.
Get full text

Abstract

Three aminoalkanethiols that have large electron-transfer rate constants, SH-(CH2)n-NH2 (n = 6, 8, and 11), were individually self-assembled on Au electrodes, followed by covalent attachment of tris(2,2′-bipyridyl)ruthenium(II) (Ru(bpy)32+) moieties onto the end of the thiols. Two separate electrogenerated chemiluminescence (ECL) waves were observed upon anodic potential scanning from 0 to 1.40 V vs Ag/AgCl (3 M KC1) over the electrode placed in 0.10 M tri-n-propylamine (TPrA)/0.10 M phosphate buffer (pH 7.4) solution. The first ECL wave, located at ∼0.88 V vs Ag/AgCl, was associated with the direct oxidation of TPrA at the electrode, and the second ECL wave, located at ∼1.12, 1.22, and 1.35 V vs Ag/AgCl for n = 6, 8, and 11, respectively, was directly related to the oxidation of the tethered Ru (bpy)32+ species. The electron transfer behavior through DNA was examined at Au electrodes, which were covalently immobilized with 15-mer and 20-mer single-stranded (ss) DNA, respectively, and then hybridized with the relevant complementary ssDNA tagged with Ru(bpy)32+ ECL labels. Under the same experimental conditions described above for Au/aminoalkanethiol- Ru (bpy)32+ studies, both double-stranded (ds) DNA displayed similar ECL responses, with the first ECL peak at ∼0.88 V and the second one at ∼1.22 V vs Ag/AgCl. No peak potential shift for the second ECL wave and no impact of the dsDNA on the entire electron transfer processes were observed, suggesting that complementary dsDNA helical structures can transfer electrons at a very large rate constant and that dsDNA studied were very conductive. In contrast, an electrode attached with 15-mer ssDNA-Ru(bpy) 32+ did not show the second ECL wave, implying that ssDNA was not electronically conductive. © 2008 American Chemical Society.

Cite

CITATION STYLE

APA

Pittman, T. L., & Miao, W. (2008). Examination of electron transfer through DNA using electrogenerated chemiluminescence. Journal of Physical Chemistry C, 112(43), 16999–17004. https://doi.org/10.1021/jp805791p

Register to see more suggestions

Mendeley helps you to discover research relevant for your work.

Already have an account?

Save time finding and organizing research with Mendeley

Sign up for free